fdf

MPV/pipeline_helper.py

@@ -20,7 +20,7 @@ This helper is intentionally minimal: one request at a time, last-write-wins.
 
 from __future__ import annotations
 
-MEDEIA_MPV_HELPER_VERSION = "2026-03-22.6"
+MEDEIA_MPV_HELPER_VERSION = "2026-03-23.1"
 
 import argparse
 import json
@@ -1197,6 +1197,17 @@ def _acquire_ipc_lock(ipc_path: str) -> Optional[Any]:
         lock_path = _get_ipc_lock_path(ipc_path)
         fh = open(lock_path, "a+", encoding="utf-8", errors="replace")
 
+        # On Windows, locking a zero-length file can fail even when no process
+        # actually owns the lock anymore. Prime the file with a single byte so
+        # stale empty lock files do not wedge future helper startups.
+        try:
+            fh.seek(0, os.SEEK_END)
+            if fh.tell() < 1:
+                fh.write("\n")
+                fh.flush()
+        except Exception:
+            pass
+
         if os.name == "nt":
             try:
                 import msvcrt  # type: ignore